19764728700 has 144 divisors (see below), whose sum is σ = 60840105984. Its totient is φ = 4936780800.

The previous prime is 19764728699. The next prime is 19764728743. The reversal of 19764728700 is 782746791.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1066917 + ... + 1085283.

It is an arithmetic number, because the mean of its divisors is an integer number (422500736).

Almost surely, 2^19764728700 is an apocalyptic number.

19764728700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19764728700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30420052992).

19764728700 is an abundant number, since it is smaller than the sum of its proper divisors (41075377284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19764728700 is a wasteful number, since it uses less digits than its factorization.

19764728700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18612 (or 18605 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 51.

The spelling of 19764728700 in words is "nineteen billion, seven hundred sixty-four million, seven hundred twenty-eight thousand, seven hundred".